Motorised Coach and Animal Express

nigel, when i read your thread title, i will honestly admit i thought you had found our mystery motorised blue "coach" lol.

Funny you should say that I saw an auction 'lot' earlier which had exactly one of those light blue motorised train coaches

Not that it means I know where they come from or what they go with, but I suspect it is just a variant of the green one already mentioned, maybe a special japanese release or something...